diff --git a/tests/test_interestCalculator.c b/tests/test_interestCalculator.c
new file mode 100644
index 0000000..04907ed
--- /dev/null
+++ b/tests/test_interestCalculator.c
@@ -0,0 +1,50 @@
+#ifdef TEST
+
+#include "unity.h"
+#include "interestCalculator.h"
+
+void setUp(void)
+{
+}
+
+void tearDown(void)
+{
+}
+
+void test_initiateInterest(void) {
+
+   /* Arrange */
+
+    int length   = 10;
+    float startAmount[] = {34, 233, 4400, 1600, 245, 34544, 3767.32, 1422, 5435, 8199};
+    float yearlyInterest=12;
+    float durationInYears=2.5;
+
+    float monthlyInterest=8;
+    float durationInMonths=3.9;
+
+    float resultsYearly[length];
+    float resultsMonthly[length];
+    
+    float expectedYearly[]={44.2,302.9,5720,2080,318.5,44907.2,4897.516,1848.6,7065.5,10658.7};
+    float expectedMonthly[]={44.608,305.696,5772.8,2099.2,321.44,45321.73,4942.724,1865.664,7130.72,10757.09};
+
+   /* Act */
+
+    for (int i = 0; i < length; i++) {
+        resultsYearly[i]=initiateInterest(startAmount[i],yearlyInterest/100, durationInYears);
+    }
+    for (int i = 0; i < length; i++) {
+        resultsMonthly[i]=initiateInterest(startAmount[i],monthlyInterest/100, durationInMonths);
+    }
+
+   /* Assert*/
+
+    for (int i = 0; i < length; i++) {
+        TEST_ASSERT_EQUAL_FLOAT(expectedYearly[i], resultsYearly[i]);
+        TEST_ASSERT_EQUAL_FLOAT(expectedMonthly[i], resultsMonthly[i]);
+    }
+}
+
+
+#endif // TEST
\ No newline at end of file